call us...use silproof, not in full sun & heat. Scrape all surfaces & wipe with alchohol. You should scribe a line of the hole from the inside, cut with a razor & remove the outside & paint w/flat blk paint - it will cover the sealant and give some nice bling. We use dbl foam tape to prevent the sealproof from going inside..and then fill in the outside with enough to make a nice dip-edge edge...MAKE sure to tape around both the exterior & interior of the port hole. It is 50% art, & 50% skillful science. Almost everyone who tries it....comes back & we go out to do it right.

Would you take you childs appendix out? Time to think if you can afford to go cheap. My friends says she is to poor to do things cheaply. My father asked me once:
What is the most expensive thing you can do?
Answer: buy or do something on the cheap. Just friendly advice.